Apparatus and process for making fan rotors



Julie 13, 1933. R.. l; GRAF APPARATUS AND PROCESS FOR MAKING FAN ROTORS 7 Sheets-Sheet 1 Filed larch 13, 1931 mvam'ua en/Mann 1. $84K BY W 9* W ATTORNEY J 1933- v R. I. GRAF 1313,591

FIG. 4-

APPARATUS AND PROCESS F'Qk MAKING FA N ROTORS F116;: l larch is, 19:51 7 Shuts-$1991. 4

Max

I NVEN TO R 24 VI /0N0 I. ,9

Wv-W June 1933.

R. l. ems- 1,913,591

APPARATUS AND PROCESS FORMAKING FAN ROTORS Filed March 13, 1931 Sheets-Sheet 5 INVENTOR EHYMOND I. QAF.

3/ BYIMLM; 'r W -June13, 1933.

' APPAnAiws AND PROCESS Fonjmucma FAN 1101-0113 31166 March '13, 19:51 7 Sheets-Sheet 6 FIG. 7

mvEN'rQR EAYMQND I. 507;. BY W R. I." GRAF 1,913,591

APPARAfus AND PROCESS FOR MAKING FAN noroks Filed'llarch' 13, 1931 7 Sheets-Sheet 7- 4 Fm.

BYWYMAL,

ATTO RNEY? Patented June 13, 1933 the punching operation,

UNITED STATES- PATENT oFFrcE RAYMOND'IVAN GRAF, OF GRAND RAPIDS, MICHIGAN,

BLOWER CORPORATION, OF DETROIT,

as'smnon ro AMERICAN- MICHIGAN, A CORPORATION OF DELAWARE APPARATUS AND PROCESS FOR MAKING FAN ROTORS Application filed March 13, 1931. Serial No. 522,271.

This invention relates to a mechanism and method of producing fan wheels.

It is the object of the invention to produce avian wheel havinga plurality of struck-up louvres punched in the side walls of a cup that has been pre-formed out of an integral piece of metal into cup form. In particular, it is the object of the invention to provide a mechanism and a method by' which the cup blank is mounted upon a yieldable die-support or slide assembly that is adapted to receive the punch; and, during I the punch audits support yieldingly moves the die, die support which constitutes the slide assembly, and cup being punched, and, at the same. time,

positions and index mechanism which, upon a return of the punch and its support, is rotated thereby to move the support over the work to a new position for the next punching operation.

Referring to the drawings: Figure 1 is an sometric perspective with the work piece, such as a cup, removed, and

with the cup clamp removed and the pressin open position; in this view the die is shown in the slide assembly in actual cutting position but the punch is raised for the purpose of. illustration;

Figure 2 is a perspective of the die shoe;

Figure 3 is a perspective of the slide assembly-with the frame partially broken away to show one of the spring push pins and to show the spring-pressedfriction plunger on the index wheel;

Figure 4 is a perspective looking upwardly from the rear at the bottom of the punch holder, the punch'hol'der being partially brolocates the index plate;

Figure 5 is a section through the assembly mechanism with a cup d locked imposition an being punche Figure 6 isa' perspective of the clamp plate die supporting punch holder which ken away to show the spring plunger which faces 12 and 13 on the of the punch.

Figure 9 is a side elevation thereof after being punched;

Figure 10 is a of Figure 9.

Figure 11 is a section similar to Figure 5 showing the Work piece prior to punching.

Figure 12 is a similar view showing theworkpiece just as it is being punched.

Figure 13 is a section on the line 13-43 of Figure 11 showing the work piece after one fan blade has been punched and it has been rotated to a new position.

Figure 14 is a perspective of block.

Pwnch holder Referring to the drawings in detail, 1 is a supports the depending punch 2. The punch holder 1 is provided with any suitable press to be carried by the moving head of the press. It is provided with a pairof apertures 4 which receive the guide pins 5 that serve to align and locate the punch holder and punch.

Die shoe A die shoe 6 is provided with 51m 7 on either side thereof for the bolting of the shoe to the bed of: the press. The intermediate section on the line 10--10 the die and portion of the die shoe is provided with a U- L shaped abutment with its open end outwardly designated 8 which forms the chamber that member 3 for locking in the receives the reciprocating die assembly hereinafter described. The surfaces 9 and formthe side walls of this U-shaped cut away portion,.in the outer face of which isa ver tical guide way 11, and i which is a vertical guide Way having the sides thereof.

At the lower edges of the side walls 9 and in the rear face of i0 are. the horizontal shoulders 14, and bed tween these shoulders a U-shaped slot 15.

The abutment walls 8 carry in the apertures 16 the guidepins .5. The upper surfaces of the abutments 8 carry the bumping pads 8a which regulate the exact depth of the stroke Die and slide assembly The slide for carrying the work cup yield-.

ingly consists of a horizontal block 17 that.

extends fore and aft beneath the die shoe and extends upwardly at the back of the die shoe between the walls 12 and 13 in the groove thus formed by those walls as at 18. The upper portion 19 .of this rear wall of the slide has mounted therein the springs 20 and spring pins 21 which are thrown upwardly by the springs 20 and areresisted intheir upward movement through the agency of the plate 22 mounted on the portion' 19 by the screws 23, the parts being so arranged that the shoulder 24 on the pin 21 engages the under side of the plate 22. The function of these pins will be hereinafter described. This back plate also serves to support the die shaft 25, the forward end of which is rotatably mounted in the support 26 which is bolted by the bolts 27 to the face 28 of the horizontal plates 17. Through this plate 17 is mounted the spring rod 29 with a sliding fit. The upper end 30 of this rod is threaded into the bottom of the die shoe into which it is thus stationarily mounted. The lower end of this rod has mounted thereon an adjustable nut 31, a spring supportin washer 32 and around the rod 29 is mounte the helical spring 33 which is interposed between the washer 32 and the bottom of the bottom plate 17.

The inside of the back plate 18 is provided with a rib 34 that acts as a guide as it slides in a slot in the rear of the die shoe, marked 1111, which corresponds to the slot 11.

Die mounting lar cut away portion on its upper .side just over the shaft 25 which forms a pair of spaced ears 37. Mounted in this cut away portion ofthe plate 35 between the ears 37 is a plate that is of similar rectangular form to the cut away portion in the plate 35 and designated 38. It is provided with an outwardly extending arcuate plate 39 which has formed in the upper face thereof the die wall 40 with the die opening 41 therein for receiving the nose 42 of the punch 2 after it passes through the metal cup which lies over the die and between the die and the punch. The inside periphery of the metal cup adjacent its open end, designated 43, is mounted on'the side wall 44 of the plate 35 and the continuation of that side wall at 45 which has the outer surface of the late 38 that is a part of the die support. 7 bus, the cup is aligned and held in roper punching position. The depth of the plate 38- is less than the depth of the cut away portion in the plate 35 so that when there is a slight relative movement between the two, the cup can rought into engagement on its inner side with the surface 45 and the top of the die 40 for punching and when the cup is elevated above those parts, the louvre thus formed will be brought out of the die slot 41 to permit rotary movement aboutthe die 40 to index the cup to the next position for punching'the next louvre. I

The end of the cup has an end wall 46 with ana erture 47 through which projects the end 0 the shaft 25 as at 48. Mounted adjacent this end 48 is a plate 49 and an inner plate 50 having indexing projections 51. A spindle 52 with flat sides 53 is mounted in spaced relationship to the plates 49 and 51) on the end of the shaft 25. The indexing projections 51 fit in corresponding notches 51a adjacent the hole 47 of the cup. The clamp plate 54 has a square opening 55 which receives the square head 52 on the shaft 25. This plate 54 is slipped over the head and then rotated into locked position by the fingers 56 so that the cup is clam ed in nonrotatable position upon the shaft 25 and is ada ted to rotate with the shaft with respect to t e die and punch. 57 is the die supporting block attached by the screws 58 to the shoulders 14, thus bridging the slot 15. The underside 59 of the block 57 rests upon the shoulders 14.

Indexing mechanism The shaft 25 carries on its inner end hehind the back plate 18 an indexing wheel 60 with the teeth 61. This Wheel is engaged between its teeth by the sprin pressed plunger nose 62 pressed downwardly by the spring 63. This plungernose is carried in the punch holder 1. The nose 62 projects'through a slot 64 that receives the teeth 61 in the block 65 attached by screws 66 to the bottom of the punch holder 1. This block serves to retain the plunger 62a carrying the nose 62 against the outward pressure of the spring 63. Thus, this nose, when the punch holder 1 descends, engages between the teeth 61'of the indexing wheel 60 to hold the cup in proper aligned position for the punching operation.

There is also carried on the punch holder 1 a dependin finger 67, the lower end of which has a horizontally disposed pawl 68 that is heldin position by the spring 69 connected to .it and to the finger 67. This pawl is adapted to move upwardly at its inner end as the finger 67 and punch holder 1 descend. It engages with the escapement 70 that acts as a guard over the teeth 61 at this point. This esca ement is mounted upon the die shoe 6. owever, on the upward stroke, the nose of the detent 68 will engage between the pair of teeth 61 to rotate the index wheel 60, shaft 25 and the cup so that the'side wall 43a of the cup will be-moved to present a new punchin surface for the next punching operation rom which is punched the louvre 43b.

The regulated by the brake in 71, which is spring pressed by the spring 2 against one face of movement of the index wheel 60 is the index wheel 60. Itreciprocates in a plate 73 mounted on the back of the back plate 18 v whilethe spring? 2 is carried'within the back plate 18;

There is a shoulder 71a on'this pin 71 which engages with the back of the plate 7 3 so that the plate prevents the pin 71 from anism rotates the work to a new position for resistance of the work supportspring33isoe the index plate 60 asa new; unching operation. 7

' On t e downward stroke of the press, the punch holder 1 engages the opening pins or plungers 21 against the resistance of the springs 20. The springs 20- are stronger than thespring 33. Hence, the spring 33 is compressed as the complete slide assembly carrying the die and work travels downwardly until the cupis settled in place. on the die 40. The springs 20 are then compressed as the punch 2 and its nose 42 penetrates the wall of' the cup cutting and forming the louvre 43b. The bumping pads 8a regulate theiexact depth of the stroke. .In the same period of time, the index plate 60 is located by the spring plunger nose 62, and-the pawl 68 passes over the esca ficient lost motion or proper indexing.

Onthe u ward stro e of the" press, the slide assemb y is raised by the spring 33, lifting the complete louvre out of the die 40 so that the cup can be rotated in unison with it is engaged by the pawl 68 between the teeth 61, thus bringing the cup into position for another cycle to cut the next louvre.

Thesequence of. operations is as follows: 1) The; punch support travels downwardly' until it engages the springpins 21.

(2) The strongersprings 20 overcome the that the'work descendsuntil it engages the topof the die.

. (3) The indexing nose 62 engages between' the teeth 61 of the plate' 60.to hold thetworkh .in punching-position. '1

takes l T The punching 33 returns the work to f its initial position so the work c'anclear the die. J a

' -(6) The work and index plate are rotated by the engagement of the; pawl '68 with the yieldingly held against the Upon the elevationof the.

indexing mech- 'moviiig the punch,

punch towards the work and die, that the louvre thus formedin e vapproaches, punching the work, removing the punch, releasingitheholding of the work with respect to the teeth 61 of the index plate so to retete the work to a new position, the outer surface 44 of the plate 35 acting asa guide for this rotation of the work.

Thus, the work is yieldinglg brought and ie, the punch punches the work against the'resistance of theyielding means interposed between the punch and die to absorb the shock of punch ing. Then the punch is removed, the work separated from the die, rotated to a new position,.and the next operation continues as heretofore described.

It will be understood that I desire to comprehend within my invention such modifications as may be necessary to adapt it to var ing conditions and uses.

' 'avmg thus fully described my invention what I claim as new and desire to secure by Letters Patent, is:

'1. In a method of forming a fan rotor,

positioning and yieldingly supporting a rotor blank in the path of a punch and over a die, moving the blank against the die, moving-the punch against the blank'over the die andthrough the blank into the die and by one operation withdrawing the punch, ele vating the blank and rotating it to a new position.

2. In a method of forming afan rotor, positioning and yieldingly supporting a rotor blankjn the path of a punch and over a die, moving thesblank against the die, moving'the punch against the blank over the die and throughthe blank into the die, and withdrawing the punch, elevating the blank above the 'die, and at the same time rotating the i blank over the die to a new position. ement 7 0 providing suf- V 3. In a methodof forming a fan rotor, po-

sitioning the work for rotation over. a die, moving the work against the die, moving a punch towards the work and die, holding the work against lateral movement as the punch approaches, punching the work and by one operation withdrawing thepunch, elevating the blank and rotatin it to a new position.

; 4. In a'method of orming afan'irotor',":positioning the work for rotation ,overthe'die, moving the work against the die, moving the punch. towards the work and die, holding the work against lateral movement as the punch .appmaches, =punching' the work, i rereleasing the holding of the work with respect to thevdie, elevating .the work from the die at the same time and .removing by elevating and rotating the In a method of forming a fan rotor, po-

Th h d t d Psi ioningthe-work. for rotation over the die, I (5) e punc returns an as a oes soy the spring moving the work against the die, moving the holding the work against lateral movement. as the punch ie, elevating the work from the die, removing the punched .portion of thework from the die, and at the same time 7 above and away from it, yieldingly holding I tionship over a die, yieldinglyresisting the ing means to move the work piece on piece in its elevated position it awayfrom it, by one movement depressing the work against said yielding means into engagement with the die and thereafter punching the work and by one operation withdrawing the punch, elevating the blank and rotating it to a new position.

7. In a method of forming a fan rotor, placing a fan rotor work piece over a die above and away from it, yieldingly holding it away from it, depressing the work against said yielding means into engagement with the die, punching the work, and yieldingly resistin the punching of the work.

8. a method of forming a fan rotor, holding a rotor work piece in spaced relationship over a die, yieldingly resisting the movement of said work piece to said die,

moving'a, punch towards said work piece and die, yieldingly resisting the movement of said punch towards the work and die, and

utilizing said last mentioned yielding means -for'compressing the first mentioned yielding means to move the work piece on to the die.

.9. In a method of forming a fan rotor,

holdingaa rotor work piece in spaced relationship over a die, yieldingly resisting the movement of said work piece to said die, moving a punch towards said work piece and die,

yieldingly resisting the movement of said' punch towards the work and die, utilizing said last mentioned yieldlng means for compressing the first mentioned yielding means 10 move the work piece 'on to the die, aligning said work piece on the die as the punching takes place. 7

10. In a method of forming a fan rotor, holding a rotor work piece in spaced relamovement of said work piece to said die,

moving 'a punch towards said work piece and die, yieldingly 'resisting the movement of said punch towards the work and die, utilizing said last mentioned yieldin means for compressing the first mention yield to the die, align ng said work piece on the die as the punching takes place, releasing said aligningof the work piece, permitting the elevation of the work piece, and rotating the work ing position over the die.

11. In combination, a die shoe, a die, a reciprocatoryworksupport cooperating with I the die shoe in holding the work whilebeingpunched,-and a punch. I

12. In combination, a dieishoe, a die, a reciprocatory work support cooperating with means to align said'work as to a new punchthe die shoe in holding the work while being 13. In combination, a die shoe, a die, a reciprocatory work support, a punch, yielding means between said die shoe and work sup port adapted to yieldingly resist the bringing of the work into engagement with the die, means on said punch for compressing said yielding means to so move said work, supplementary yielding means between said work support and said punch.

14. In combination, a die shoe, a die, a reciprocatory work support, a punch, yielding means between said die shoeand work support adapted to yieldingly resist thebringmg of the work into engagement with the die, means on said punch for compressing said yielding means to so move said work, supplementary yielding means between said work support and said punch of greater strengthvthan the yielding means between the work support and die shoe.

15. In combination, a die shoe, a reciprocatory work support,-a die over which said work is supported, a punch adapted to move saidwork and work support to bring the work into engagement with the die, and

p the punch approaches the die, punches and is removed therefrom.

tory work support, a die over which said work is supported, a punch adapted to move said work and work support to bring the work into engagement with, the die, means to align said work as the punch approaches the die, punches and is removed therefrom, and means to rotate said work with respect to said die.

17. In combination, a die shoe, areciprocatory work sup ort, means for clamping work thereon, said means comprising cooperating parts on the die shoe and the work clamping means, shoe, yielding means between said work support and die shoe, a punch adapted to move Said vgork support and work against the die and against said yielding means.

a die mounted on said die 18. In combination, a die shoe, a reciproa reciprocatory work support, means for means, and means to clamping work'thereon, a die mounted on said die shoe,

' 35 adapted to engage means between said worksupport and punc yielding means between said and die shoe, a punch adapted to 'movesaid work support and work against the die and against said yielding means, means to rotate said work to a new position when'the punch and work are moved relatively with respect to said die, and sup lementary yielding means between said wor support and punc for yieldingly resisting themovementof the port, a die mounted on the die shoe, yielding r 36 support.

work'supp'ort and-the punch relativeto one another, and the punch relative to the'j'dle and the work. j

20. In combination, a die shoe, a worksnpport including a circular plate, coo 'rat1ng with. the die shoe to grip the wor before.

and during punching act1on,'a die mountedmeans between said work support and punc 22; In combination, a die, shoe,- a work sup: port, a die'mounted on the die shoe, yielding means between the for normally maintaining the \yvork away from the die, a punch and punch sup rt the work support, yie

' support, of greater strength than the yieldshoe. r r i 23. In combination, a die shoe, a work sup- -port, a

in-g means between the work support and die die mounted on-the die. shoe, yielding d die means between the work support an shoe for normally maintaining the work port adapted to engage the work support, yielding means between said worksupport and punch support, of greater strength than I the yielding means between the work supand aligning means adapted to hold. said work against. lateral moveo'rt. and die shoe,

ment during punching by the punch.

245, In combmation, a dieshoe, a work snpport, a "die mounted on the dieshoe, yieldlng means between the work support and die shoe for normally maintaining the work away from the die, a punch and punch support means between said work'support and punch shoe, aligning means adapted to hold said;

work

against lateral movement, during punching by the punch, and indexin means adapted to rotate the work after e evation work supportfrom the-die, said indexing means being operated from said punch support.

.25. In combination, a dieShoe, a .die supported thereon, a vbodily reciprocatory work support, means 7 for. rotatably supporting workthereon' over said die, yielding means for norm'all maintaining said work and die the punching by'th'e punch.

26. In combination, a die shoe, a die supported thereon, a bodily reciprocatory work in separate condition, and a punch adapted {to engage said work support to cause the work to engagethe die prior to and during said punch for maintaining said work against lateral movement during punching.

27. In combination, a die shoe, a die supported thereon, a bodily reciprocatory work support, mpans for rotatably supporting work ,mally maintaining said work and' die in se'pa '90 thereon o fi -said die, yielding means for nor- 1 I rated condition, a punch adapted to engage I said 'work support tocause the work to engage the die prior to and during the punchmg by the punch, and means connected to said mounted thereon, a stationary die, yielding means between the work support and die shoe,

k support d di hoe punch for rotating said work on its work'sup- 4 a punch, and punch support, ielding means interposed between the punc support and the work support of greater strength than the yielding means between the work support and the die shoe, and indexing means for ro- 29. In combination, a die shoe, a die, a work support, means for .yieldingly resisting relative vertical movement between the die and tating said work carried by said punch supaway from the die, a punch and punch sup- P work carried on the-work support, means for and the work and work support, means to yieldingly resist lateral movement-therebetween, and a punch. 4

- 30. In combination, a dieshoe, a die, a

work support, 'means for yieldingly .resist-' ing relative vertical movement between the .efl'ectingrotary movement between the die die and work carried on the work support,

the die and the work and work support, means support.

. f if t' ta b t adapted to g g thework s pp fy mg means or e ec mg ro ry movement e Ween v 31. In combination, a die shoe,'a die, a work support, means for yieldingly resisting relative vertical movement between theldre: and

work carried on the work support, means for effecting rotary movement between thedie and the work and work support, means to yieldingly resist lateral movement therebe-. tween, a punch, and means to yieldingly resist the approach of the punch to the work support, said last mentioned yielding means being stronger than the first mentioned yieldmg means. I

32. In combination, a die shoe having spaced abutments, a work support guided thereon therebetween, a shaft carried by said work support extending between said abut. ments, an indexing wheel on one end of said shaft, and an aligning plate mounted on said work support adjacent said shaft at the other end thereof, a lock on said Work thereon around said plate, said plate having an annular slot therein, a. die carried between said abutments having a plate extending into the slot of the first mentioned plate but of less depth than said slot, and yielding means interposed between said work support and said die shoe to resist, relative movement therebetween.

33. In combination, a die shoe having spaced abutments, a work support guided thereon therebetween, a shaft carried by said work support extending between said abutments, an indexing wheel on one end of said shaft, an aligning plate mounted on said work support adjacent said shaft at the other end thereof, a lockon said shaftfor locking work thereon around said plate, saidj'plate having an annular slot therein, a die carried abetween said abutments having a plate extending into the slot of the first mentioned plate but of less depth than said slot, and yielding means interposed between said work support and said die-shoe to resist relative movement therebetween, s ring-pressed plungers extending upwardly support, a punch, and-a punch support adapted to engage said plungers.

34. In combination, a die shoe having spaced abutments, a work support guided thereon therebetween, a shaft carried by said work support extending between saidfabut ments, an indexing wheel on one end of'said shaft, an aligning plate mounted on said work support adjacent said shaft at the other end 'thereof a lock on said shaft for lockin thereon around said plate, said plate h an annular slot therein,

said abutments having a plate extending into the slot of the first less depththansaid slot,yielding means interposedbetween said work support and said die shoe to resist relative mqvement therebetween, spring-pressed .plungersextending upwardly from and a punch support adapted'to engage said pl ungers,-a depending finger .on said punch support, a pawl thereon adapted said indexing wheel to rotate it.

to engage shaft for locking rom said die work aving a die earned between.

mentioned plate but of said die support, a punch.

shaft, an aligning plate mountedon said work support adjacent said shaft at the other end thereof, a lock on said shaft for locking work thereon around said plate, said plate having an annular slot therein, a diecarried between said abutments having a plate extending into the slot of the first mentioned plate but of less depth than said slot, yielding means interposed between saidi'work support and said die shoe to resist relative movement therebetween, spring-pressed plungers extendand a punch support adaptedto engage said plungers, support, a pawl thereon adapted to engage said indexing wheel'to rotate it, an escapement mounted on said die shoe around a portion of: said wheel, said pawl being arranged to pass over said escapement and wheel on its downward stroke and to engage with and rotate said wheel on its upward stroke.

36. As an article of manufacture for punching the rotor of a fan, a punch support, a punch on the support, a depending finger fixed to the support and having a spring pressed pawl mounted on one end thereof, and a spring-pressed aligning plunger in said Support v 37. As an article 'of manufacture for punching the rotor of a fan, an indexing wheel, 'apunch support, a punch, a depend-, ing finger and spring mounted on one end thereof, a and a grooved retaining plate therefor for receiving the indexing wheel in engagement with said spring-pressed plunger.

38. In combination, a work support, a shaft thereon having, a squared head, a spaced shouldertherefrom,interiorlydisposedspaced notches thereon spaced from said squared head. said notches adapted to receive similar notches in a work piece, a locking plate having a squared aperture therein to pass'over said head. on the shaft, and means on said plate for moving with the work piece on said notches.

39. In a press for forming a fan rotor. a work support, means to 'rotatably mount a rotor work piece thereon. means engaging the inner periphery thereof work piece in its rotary movement, means on the rotary" support 'for aligning the. work piece thereon against relative rotary movement, and means to lock said work piece there On. c I.

40. In a press for forming a fan rotor. a work sup ort. means to 'rotatably mount a rotor work piece thereon. means engaging the inner periphery thereof for aligning said ort' guided a depending finger on said punch spring-pressed aligning plunger,

mg upwardly from said die support, a punch,

it into locking engagement 11 for aligning said lad work piece in its rotary movement, means on interposed shoe pads, a punch 'first mentioned yielding the rotary support for aligning the work piece thereon against relative rotary movement, means to lock said work piece thereon, and indexing means for rotating said rotor support, work piece and look as a unit.

41. In a press for forming a fan rotor, a work support, means to rotatably mount a rotor work plece thereon, means engaging the inner periphery thereof for aligning said work piece in its rotary movement, means on the rotary support for aligning the work piece thereon against relative rotary movement, means to lock said work piece thereon, indexing means for rotating said rotor support, work piece and lock as a unit, and a brake between said work support and said indexing means.

42. In combination, a die shoe, a reciprocatory work support, a stationary die, die shoe pads, a punch and punch support limited in their movement by said pads with respect to said die, yielding means between said work support and said punch support, yielding means between said work support and die shoe, said yielding means being of different strengths, whereby the first mentioned yielding means will cause the compression of the second mentioned yielding means to bring the work on the, die, and

the first mentioned yielding means will there- 5 after resist the movement of the punch through the work and into the die.

43. In combination, rocatory work support, a stationary die, die

and punch support limited in their movement by said pads with respect to said die, yielding means between said work support and said punch support, yielding means between said work support and die shoe, said yielding means being of di'fi'erent strengths, whereby the first mentioned yielding means will cause the compression of the second mentioned yielding means to bring the work on the die, and the means will there-' afterresist the movement of the punch through the work and into the die, and means of guiding the punch support with respect to the die shoe and die.

44. In combination, a shaft, an abutment thereon'spaced from one end thereof, a plurality of interiorly-disposed aligning shoulders on the face of said. abutment, a squared head on said shaft spaced from said aligning shoulders to form a groove therebetween, a locking plate having a squared aperture to pass over said head and to be located-in said groove behind said head, and fingers on said locking plate for aetuatin it affix my signa- In testimony whereof, ture.

' RAYMOND IVAN GRAF.

a die shoe, a recip- 

